// 
// ArithmeticInstruction.cs:
//
// Authors: Marek Safar (marek.safar@gmail.com)
//     
// Copyright 2014 Xamarin Inc
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//

using System;
using System.Diagnostics;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;

namespace Microsoft.Scripting.Interpreter {
    internal abstract class ArithmeticInstruction : Instruction {

        public override int ConsumedStack { get { return 2; } }
        public override int ProducedStack { get { return 1; } }

        protected abstract object Calculate (object l, object r);

        public override int Run(InterpretedFrame frame) {
            object l = frame.Data[frame.StackIndex - 2];
            object r = frame.Data[frame.StackIndex - 1];
            frame.Data[frame.StackIndex - 2] = Calculate (l, r);
            frame.StackIndex--;
            return +1;
        }
    }
}
